The 2 Liter lightbulb!
How do they make this thing work at night though? In the video I saw at literoflight.org the people have a tube like thing in the bottle with something giving off the light, and there has to be something retaining the energy during the day. This would be a great science fair project! Anybody know how to do this? There is more to it than just the bottle, water, bleach, holes, rivets and sealants. They are using these at night.
The 2 liter lightbulb!
Two gases are contained in gas bulbs connected by a valve. Gas A is present in a 1 L bulb at a pressure of 818 torr. Gas B exerts a pressure 328 torr in a 1 liter bulb. The valve is opened and the two gases come to equilibrium. What is the partial pressure of gas A after equilibrium has been established, reported to the nearest whole number.
For gas A, it begins at a pressure of 818 torr in a volume of 1 L. At the end of the experiment it is now in a volume of 2 liter after the valve is opened. The question is essentially asking what is the new pressure of gas A.
If blue light does have adverse health effects, then environmental concerns, and the quest for energy-efficient lighting, could be at odds with personal health. Those curlicue compact fluorescent lightbulbs and LED lights are much more energy-efficient than the old-fashioned incandescent lightbulbs we grew up with. But they also tend to produce more blue light.
The physics of fluorescent lights can't be changed, but coatings inside the bulbs can be so they produce a warmer, less blue light. LED lights are more efficient than fluorescent lights, but they also produce a fair amount of light in the blue spectrum. Richard Hansler, a light researcher at John Carroll University in Cleveland, notes that ordinary incandescent lights also produce some blue light, although less than most fluorescent lightbulbs.